"At the end of the day, I'm just a mom. I'm trying to make the best decision for my kid," Cavallari said on Bravo's Watch What Happens Live March 18.

There are very scary statistics out there regarding what is in vaccines and what they cause: asthma, allergies, ear infections, all kinds of things. And we feel like we're making the best decision for our kids."

Kristin was responding to the following viewer question: "How can you knowingly support the spread of potentially deadly diseases by not vaccinating your children?"

Cavallari recently ignited a media firestorm after revealing she has never vaccinated her one-year-old son, Camden, because she's worried that vaccines cause autism. The former reality TV star is now pregnant with her second child.

"I've read too many books about autism," Kristin, 27, told the HuffingtonPost. "Autism wasn’t prevalent — like it is now — years ago, so something is going on, whether it’s the chemicals in our food or the vaccines. Something is happening, and we can’t really ignore that. I choose to believe that I think it’s in the vaccines but, again, to each their own and that’s where I stand on it."

Cavallari, who's married to Chicago Bears quarterback husband Jay Cutler, isn't the only celebrity who's opposed to vaccinations. "The View" host Jenny McCarthy, whose 11-year-old son Evan is autistic, has also slammed vaccinations.

McCarthy was recently attacked on Twitter for saying Evan's autism was caused by the MMR (measles, mumps and rubella) vaccine he received as a baby. In 2007, Jenny launched an anti-vaccine movement, which has been a continuing source of controversy for her.

Critics say McCarthy is spreading misinformation that could result in children's deaths. In response, Jenny said she has done extensive research and is convinced that the toxins in vaccinations contribute to autism.

"Isn't it ironic, in 1983 there were 10 shots, and now there's 36 and the rise of autism happened at the same time?" McCarthy told Larry King in a 2008 interview. "We need to get rid of the toxins, the mercury — which I am so tired of everyone saying has been removed. It has not been removed from the shots."

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Samantha Chang is the co-owner of www.theimproper.com., an arts and entertainment website in New York City. A graduate of the University of Pennsylvania, Samantha enjoys running, cycling and taking photos. Contact her at schang@theImproper.com.